Support any expression if the connection vendor isn't mongodb

Author: WaVEV

django_mongodb_backend/expressions/builtins.py

@@ -107,14 +107,14 @@ def expression_wrapper(self, compiler, connection):
     return self.expression.as_mql(compiler, connection, as_expr=True)
 
 
-def index_expression(self, compiler, connection, as_expr=False):
+def index_expression(self, compiler, connection, as_expr=False):  # noqa: ARG001
     result = []
     for expr in self.get_source_expressions():
         if expr is None:
             continue
         for sub_expr in expr.get_source_expressions():
             try:
-                result.append(sub_expr.as_mql(compiler, connection, as_expr=False))
+                result.append(sub_expr.as_mql(compiler, connection))
             except FullResultSet:
                 result.append(Value(True).as_mql(compiler, connection))
     return result

django_mongodb_backend/schema.py

@@ -353,10 +353,13 @@ def _remove_field_index(self, model, field, column_prefix=""):
         collection.drop_index(index_names[0])
 
     def _check_supported_expressions(self, expressions):
-        for expression in expressions:
-            expression = expression.expression if isinstance(expression, OrderBy) else expression
-            if not isinstance(expression, F):
-                return False
+        if self.connection.vendor == "mongodb":
+            for expression in expressions:
+                expression = (
+                    expression.expression if isinstance(expression, OrderBy) else expression
+                )
+                if not isinstance(expression, F):
+                    return False
         return True
 
     def _unique_supported(